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BODYMASS.C
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1996-11-24
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/* +++Date last modified: 27-Oct-1996 */
/** BODYMASS.C
* Calculate body mass index (BMI) for given height and weight.
* According to U.S. federal guidelines, a BMI of 24 or less is
* desirable. Anything higher is considered overweight.
* Donated to the public domain, October 17, 1996.
**/
short BodyMassIndex(unsigned short height, unsigned short weight)
{
/* Returns the Body Mass Index (BMI) for height in inches and
** weight in pounds. BMI is weight in kilograms divided by height
** in meters squared. Returns -1 if invalid height entered.
*/
/* Define the metric conversion constants... */
#define LBperKG 2.2046f
#define INCHperM 39.37f
#define CFACTOR ((INCHperM * INCHperM) / LBperKG)
/* Make sure height is not 0 and is 'reasonable' (100?) */
if(height < 1 || height > 100)
return -1;
return (short) ((((float) weight * CFACTOR) / (height * height)) +
0.5f);
}
#ifdef TEST
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
short bmi, h, w;
if(argc < 3)
{
printf("Usage: bodymass height-in-inches weight-in-pounds\n");
return EXIT_FAILURE;
}
h = atoi(argv[1]);
w = atoi(argv[2]);
if (h < 20 || h > 100)
{
printf("Height %d out of range!\n", h);
return EXIT_FAILURE;
}
if (w < 20)
{
printf("Weight %d out of range!\n", w);
return EXIT_FAILURE;
}
bmi = BodyMassIndex(h, w);
printf("The Body Mass Index for height %d inches "
"and weight %d pounds is %d\n", h, w, bmi);
if (bmi < 25)
printf("Congratulations! Your index is within the "
"recommended range.\n");
else
{
while((bmi = BodyMassIndex(h, --w)) > 24)
;
printf("Your index is above the recommended level of 24.\n"
"To reach that level your weight must drop to %d "
"pounds.\n", w);
}
return EXIT_SUCCESS;
}
#endif